# coding: utf-8

{{>partial_header}}

from __future__ import absolute_import

import sys
import io
import json
import ssl
import certifi
import logging
import re

# python 2 and python 3 compatibility library
from six import iteritems

from .configuration import Configuration

try:
    import urllib3
except ImportError:
    raise ImportError('Swagger python client requires urllib3.')

try:
    # for python3
    from urllib.parse import urlencode
except ImportError:
    # for python2
    from urllib import urlencode


logger = logging.getLogger(__name__)


class RESTResponse(io.IOBase):

    def __init__(self, resp):
        self.urllib3_response = resp
        self.status = resp.status
        self.reason = resp.reason
        self.data = resp.data

    def getheaders(self):
        """
        Returns a dictionary of the response headers.
        """
        return self.urllib3_response.getheaders()

    def getheader(self, name, default=None):
        """
        Returns a given response header.
        """
        return self.urllib3_response.getheader(name, default)


class RESTClientObject(object):

    def __init__(self, pools_size=4):
        # urllib3.PoolManager will pass all kw parameters to connectionpool
        # https://github.com/shazow/urllib3/blob/f9409436f83aeb79fbaf090181cd81b784f1b8ce/urllib3/poolmanager.py#L75
        # https://github.com/shazow/urllib3/blob/f9409436f83aeb79fbaf090181cd81b784f1b8ce/urllib3/connectionpool.py#L680
        # ca_certs vs cert_file vs key_file
        # http://stackoverflow.com/a/23957365/2985775

        # cert_reqs
        if Configuration().verify_ssl:
            cert_reqs = ssl.CERT_REQUIRED
        else:
            cert_reqs = ssl.CERT_NONE

        # ca_certs
        if Configuration().ssl_ca_cert:
            ca_certs = Configuration().ssl_ca_cert
        else:
            # if not set certificate file, use Mozilla's root certificates.
            ca_certs = certifi.where()

        # cert_file
        cert_file = Configuration().cert_file

        # key file
        key_file = Configuration().key_file

        # https pool manager
        self.pool_manager = urllib3.PoolManager(
            num_pools=pools_size,
            cert_reqs=cert_reqs,
            ca_certs=ca_certs,
            cert_file=cert_file,
            key_file=key_file
        )

    def request(self, method, url, query_params=None, headers=None,
                body=None, post_params=None):
        """
        :param method: http request method
        :param url: http request url
        :param query_params: query parameters in the url
        :param headers: http request headers
        :param body: request json body, for `application/json`
        :param post_params: request post parameters,
                            `application/x-www-form-urlencode`
                            and `multipart/form-data`
        """
        method = method.upper()
        assert method in ['GET', 'HEAD', 'DELETE', 'POST', 'PUT', 'PATCH', 'OPTIONS']

        if post_params and body:
            raise ValueError(
                "body parameter cannot be used with post_params parameter."
            )

        post_params = post_params or {}
        headers = headers or {}

        if 'Content-Type' not in headers:
            headers['Content-Type'] = 'application/json'

        try:
            # For `POST`, `PUT`, `PATCH`, `OPTIONS`, `DELETE`
            if method in ['POST', 'PUT', 'PATCH', 'OPTIONS', 'DELETE']:
                if query_params:
                    url += '?' + urlencode(query_params)
                if re.search('json', headers['Content-Type'], re.IGNORECASE):
                    request_body = None
                    if body:
                        request_body = json.dumps(body)
                    r = self.pool_manager.request(method, url,
                                                  body=request_body,
                                                  headers=headers)
                if headers['Content-Type'] == 'application/x-www-form-urlencoded':
                    r = self.pool_manager.request(method, url,
                                                  fields=post_params,
                                                  encode_multipart=False,
                                                  headers=headers)
                if headers['Content-Type'] == 'multipart/form-data':
                    # must del headers['Content-Type'], or the correct Content-Type
                    # which generated by urllib3 will be overwritten.
                    del headers['Content-Type']
                    r = self.pool_manager.request(method, url,
                                                  fields=post_params,
                                                  encode_multipart=True,
                                                  headers=headers)
            # For `GET`, `HEAD`
            else:
                r = self.pool_manager.request(method, url,
                                              fields=query_params,
                                              headers=headers)
        except urllib3.exceptions.SSLError as e:
            msg = "{0}\n{1}".format(type(e).__name__, str(e))
            raise ApiException(status=0, reason=msg)

        r = RESTResponse(r)

        # In the python 3, the response.data is bytes.
        # we need to decode it to string.
        if sys.version_info > (3,):
            r.data = r.data.decode('utf8')

        # log response body
        logger.debug("response body: %s" % r.data)

        if r.status not in range(200, 206):
            raise ApiException(http_resp=r)

        return r

    def GET(self, url, headers=None, query_params=None):
        return self.request("GET", url,
                            headers=headers,
                            query_params=query_params)

    def HEAD(self, url, headers=None, query_params=None):
        return self.request("HEAD", url,
                            headers=headers,
                            query_params=query_params)

    def OPTIONS(self, url, headers=None, query_params=None, post_params=None, body=None):
        return self.request("OPTIONS", url,
                            headers=headers,
                            query_params=query_params,
                            post_params=post_params,
                            body=body)

    def DELETE(self, url, headers=None, query_params=None, body=None):
        return self.request("DELETE", url,
                            headers=headers,
                            query_params=query_params,
                            body=body)

    def POST(self, url, headers=None, query_params=None, post_params=None, body=None):
        return self.request("POST", url,
                            headers=headers,
                            query_params=query_params,
                            post_params=post_params,
                            body=body)

    def PUT(self, url, headers=None, query_params=None, post_params=None, body=None):
        return self.request("PUT", url,
                            headers=headers,
                            query_params=query_params,
                            post_params=post_params,
                            body=body)

    def PATCH(self, url, headers=None, query_params=None, post_params=None, body=None):
        return self.request("PATCH", url,
                            headers=headers,
                            query_params=query_params,
                            post_params=post_params,
                            body=body)


class ApiException(Exception):

    def __init__(self, status=None, reason=None, http_resp=None):
        if http_resp:
            self.status = http_resp.status
            self.reason = http_resp.reason
            self.body = http_resp.data
            self.headers = http_resp.getheaders()
        else:
            self.status = status
            self.reason = reason
            self.body = None
            self.headers = None

    def __str__(self):
        """
        Custom error messages for exception
        """
        error_message = "({0})\n"\
                        "Reason: {1}\n".format(self.status, self.reason)
        if self.headers:
            error_message += "HTTP response headers: {0}\n".format(self.headers)

        if self.body:
            error_message += "HTTP response body: {0}\n".format(self.body)

        return error_message
